JP3903998B2 - Weighing device with weighing conveyor - Google Patents

Description

  The present invention relates to a weighing device provided with a weighing conveyor device for weighing an article to be weighed, in particular, an article to be weighed made of simmered kelp having adhesiveness.

Japanese Patent Laid-Open No. 5-126618

  For example, in Patent Document 1, there is provided a weighing device having a plurality of weighing hoppers as weighing instruments for weighing an article to be weighed such as boiled kelp and dropping the weighed article to be weighed based on its own weight. Proposed.

  By the way, in such a weighing device, in order to weigh the weighed article to be weighed by the weighing hopper which drops the weighed article to be weighed based on its own weight, the article to be weighed adheres to the weighing hopper and remains as it is. Therefore, it is difficult to continuously obtain an accurately weighed article.

  The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a weighing device including a weighing conveyor device that can continuously obtain an accurately weighed article to be weighed. It is in.

  The weighing device according to the first aspect of the present invention has a travelable endless belt on which an article to be weighed having an adhesive property is placed, and the article to be weighed placed on the endless belt A belt conveyor device that discharges by running an endless belt, and a plurality of weighing conveyor devices that support the belt conveyor device and have a measuring device for weighing an object to be weighed placed on the endless belt, and weighing A target in which a value obtained by combining a supply means for supplying articles to be weighed onto endless belts of a plurality of weighing conveyor apparatuses and a weighing value of each article to be weighed obtained by weighing by the plurality of conveyor apparatuses is set in advance. An item to be weighed by each of a plurality of weighing conveyor devices, having a selection unit for selecting the combination so as to be equal to the value, and based on a selection result in the selection unit A control means for controlling the discharge; and a collecting means for collecting the articles to be weighed respectively discharged from the plurality of weighing conveyor devices. Each endless belt has one weighed article to be weighed from above the endless belt. Each weighing instrument is adapted to travel so that it is not discharged and another weighing object is supplied to a position different from the position of the one weighing object by the supply means. An increase with respect to the measurement value of the measurement article is set as a measurement value of another measurement object. According to the weighing device of the first aspect, it is possible to continuously obtain a desired amount of articles to be weighed based on accurate weighing of articles to be weighed by a plurality of weighing conveyor devices. A plurality of objects to be weighed can be weighed by the weigher, so that the number of weighers can be reduced, the installation space of the apparatus can be reduced, and the weighing efficiency can be improved.

  In the present invention, like the weighing device of the second aspect, the belt conveyor device rotates the driving drum and the driven drum that stretches the endless belt so as to run freely, and the endless belt. A driving source that generates a driving force to be driven, and a coupling mechanism that mechanically and detachably connects the driving source and the driving drum so that the driving force from the driving source can be transmitted to the driving drum. The coupling mechanism includes a pair of rotating shafts coupled to the driving source and the driving drum, and a pair of engaging members fixed to the pair of rotating shafts and engaged with each other in the rotational direction of the pair of rotating shafts. The engagement member on the drive source side has a protrusion protruding toward the engagement member on the drive drum side, and the engagement member on the drive drum side is engaged with the engagement on the drive source side. Protruding toward the joint The protrusion of the engagement member on the drive source side and the protrusion of the engagement member on the drive drum side are engaged with each other by the rotation of the engagement member on the drive source side in the one rotation direction. On the other hand, due to the rotation in the other rotation direction of the engagement member on the drive source side, the protrusion of the engagement member on the drive source side and the protrusion of the engagement member on the drive drum side are mutually in the rotation direction of the engagement member. The engagement between the protrusion of the engagement member on the drive source side and the protrusion of the engagement member on the drive drum side is released so as to be arranged at intervals. According to the weighing device of the second aspect, since the belt conveyor device that discharges the article to be weighed by the running of the endless belt is provided, the article to be weighed by the measuring instrument is released from the endless belt. In this case, an inertial force based on the travel of the endless belt can be applied to the article to be weighed so that the article to be weighed is peeled off from the endless belt, and the possibility that the article to be weighed adheres to the endless belt and remains as it is is reduced. Thus, it is possible to continuously obtain an accurately weighed article to be weighed, and particularly because it has a connecting mechanism for detachably connecting a driving source and a driving drum. For example, when discharging an article to be weighed on an endless belt, the drive source and the driving drum can be connected by a connection mechanism, while when driving an object to be weighed on an endless belt, And in order to release the connection between the drive drum can be separated them, and Thus, it is possible to weigh the objects to be weighed article more accurately. The article to be weighed is made of an aggregate such as simmered kelp.

  In the present invention, like the weighing device of the third aspect, the surface of the endless belt in contact with the article to be weighed may contain silicon.

  According to the weighing device of the third aspect, since the above-described configuration is provided, the possibility that the article to be weighed adheres to the endless belt can be reduced.

  In the present invention, like the weighing device according to the fourth aspect, the belt conveyor device may include a drive drum and a driven drum on which an endless belt is movably stretched. The diameter of the driving drum or the driven drum arranged on the downstream end side may be small enough to peel the article to be weighed from the endless belt.

  In the present invention, like the weighing device of the fifth aspect, the diameter of the drive drum or the driven drum arranged on the downstream end side of the belt conveyor device may be 10 mm or less.

  According to the weighing device of the fourth or fifth aspect, the article to be weighed can be more reliably peeled from the endless belt.

  In the present invention, like the weighing device of the sixth aspect, each of the pair of engaging members may be a coupling.

  In the present invention, like the weighing device according to the seventh aspect, the selection unit selects a combination of weighing values of one article to be weighed obtained by weighing by each weighing conveyor device, and is not selected by the selection. The combination of the measured value of one item to be weighed constituting the combination and the measured value of another item to be weighed obtained by the weighing by each weighing conveyor device may be selected.

  According to the weighing device of the seventh aspect, it is possible to weigh a plurality of objects to be weighed by one weighing device, so that the number of weighing devices can be reduced, the installation space of the device can be reduced and weighing can be performed. Efficiency can also be improved.

  ADVANTAGE OF THE INVENTION According to this invention, the weighing | measuring apparatus provided with the weighing | measuring conveyor apparatus which can obtain the to-be-measured article correctly measured continuously can be provided.

  Next, an example of an embodiment of the present invention will be described in more detail based on an example shown in the figure. The present invention is not limited to these examples.

  1 to 7, the weighing device 1 of this example has an endless belt 3 that can travel in the direction A on which an article to be weighed 2 having adhesive properties is placed, and is placed on the endless belt 3. The belt conveyor device 4 for discharging the placed article 2 to be weighed by traveling in the A direction of the endless belt 3 and the belt conveyor device 4 are supported, and the article 2 to be weighed placed on the endless belt 3 is weighed. A plurality of weighing conveyor devices 6 provided with a weighing device 5, supply means 7 for supplying articles 2 to be weighed onto endless belts 3 of the plurality of weighing conveyor devices 6, and a plurality of weighing conveyors The selection unit 8 has a selection unit 8 that selects the combination so that the value obtained by combining the measurement values of the articles to be weighed 2 obtained by the measurement by the device 6 is the same as a preset target value. Selection in Based on the results, a control means 9 for controlling the discharge of the articles 2 to be weighed by each of the plurality of weighing conveyor apparatuses 6 and a collecting means 10 for collecting the articles to be weighed 2 respectively released from the plurality of weighing conveyor apparatuses 6. It has.

  The article to be weighed 2 may be composed of a single or aggregate of sticky food, and in this example, is composed of an aggregate such as boiled kelp.

  In this example, the plurality of weighing conveyor devices 6 that are arranged side by side in the X direction are configured in the same manner, so that one weighing conveyor device 6 will be described in detail below, and other weighing conveyor devices will be described. For the reference numeral 6, the same reference numerals are given to the drawings, and the detailed description thereof is omitted.

  The belt conveyor device 4 includes the endless belt 3 described above, a drive drum 15 and a driven drum 16 that stretch the endless belt 3 so as to be able to travel in the direction A, and a tension adjusting drum 19 that adjusts the tension of the endless belt 3. The electric motor 17 as a driving source for generating a driving force for rotating the driving drum 15 to drive the endless belt 3 in the A direction, and the driving force from the electric motor 17 can be transmitted to the driving drum 15. A coupling mechanism 18 that detachably couples the electric motor 17 and the drive drum 15 is provided. The endless belt 3, the drive drum 15, the driven drum 16, and the tension adjusting drum 19 are attached to the measuring instrument 5 via a support plate 20.

  The endless belt 3 that is flexible and extends in the horizontal direction has such a length that the two objects to be weighed 2 are placed with a distance 12 between them, and in this example, the endless belt 3 has a length of about 100 mm. Have The outer surface 21 of the endless belt 3 that is in contact with the article 2 to be weighed contains silicon. The inner surface 22 of the endless belt 3 is in contact with the driving drum 15, the driven drum 16 and the tension adjusting drum 19. The endless belt 3 is configured so that the weighed article 2a is not discharged from the endless belt 3 and that the article 2b to be weighed is supplied by the supply means 7 to a position different from the position of the article 2a to be weighed. It is also being run.

  The drive drum 15 is disposed on the upstream end side of the belt conveyor device 4 in this example, and the driven drum 16 is disposed on the downstream end side of the belt conveyor device 4 in this example.

  The diameter of the driven drum 16 is small enough to allow the article 2 to be weighed to be peeled from the endless belt 3. The driven drum 16 may have a diameter of 10 mm or less, for example, a diameter of 8 mm.

  The tension adjusting drum 19 is adapted to adjust the tension of the endless belt 3 by appropriately adjusting its position.

  The connecting mechanism 18 is fixed to the rotating shaft 25 connected to the electric motor 17, the rotating shaft 26 connected to the drive drum 15 via the gear mechanism 24, and the rotating shafts 25 and 26, and the rotating shaft 25. And a pair of engaging members 27 and 28 which engage with each other with respect to the rotation direction.

  One end of each of the rotation shafts 25 and 26 faces each other in the axial direction of the rotation shafts 25 and 26. The other end of the rotating shaft 25 is fixed to the output rotating shaft of the electric motor 17, and the other end of the rotating shaft 26 is fixed to one end of the drive drum 15.

  The engaging member 27 disposed on the electric motor 17 side includes a coupling 29 fixed to one end of the rotating shaft 25 in this example. The engaging member 28 disposed on the drive drum 15 side includes a coupling 30 fixed to one end of the rotating shaft 26 in this example.

  The coupling 29 includes an annular main body 31 and a plurality of protrusions 32 that are provided integrally with the annular main body 31 and project toward the coupling 30. One end of the rotary shaft 25 is disposed in the hollow portion of the annular main body 31.

  The coupling 30 includes an annular main body 33 and a plurality of protrusions 34 that are provided integrally with the annular main body 33 and project toward the coupling 29. One end of the rotating shaft 26 is disposed in the hollow portion of the annular main body 33.

  The plurality of protrusions 32 are opposed to the plurality of protrusions 34 with an interval 35 in the rotation direction of the couplings 29 and 30, in this example, the R1 direction and the R2 direction.

  The above coupling mechanism 18 causes the plurality of protrusions 32 to abut on the plurality of protrusions 34 as shown in FIG. 7 by the rotation of the coupling 29 in the R1 direction based on the operation of the electric motor 17, thereby couplings 29 and 30. Are engaged with each other to couple the electric motor 17 and the drive drum 15 via the couplings 29 and 30, the rotating shafts 25 and 26, and the gear mechanism 24, as shown in FIG. By releasing the coupling 29 and the coupling 30 as shown in FIG. 4 by the rotation of the coupling 29 in the engaged state with the coupling 30 in the R2 direction, the electric motor 17 and the drive drum 15 are moved. It is designed to be mechanically separated. The separation of the electric motor 17 and the drive drum 15 based on the rotation of the rotation shaft 25 in the R2 direction with respect to the rotation shaft 26 is performed immediately before the weighing object 2 is weighed by the weighing instrument 5.

  The measuring instrument 5 is a load cell as a measuring unit for measuring the total weight of the article 2a to be weighed placed on the endless belt 3, the endless belt 3, the drive drum 15, the driven drum 16, the tension adjusting drum 19, and the support plate 20. (Not shown) and the weight of the article 2 to be weighed by subtracting the weights of the endless belt 3, the drive drum 15, the driven drum 16, the tension adjusting drum 19, and the support plate 20 that are measured in advance from the total weight measured by the load cell. And a calculation unit (not shown) for calculating the value. In this example, when the weighing object 2b is placed on the endless belt 3 in addition to the already weighed article 2a, the weighing instrument 5 and the endless belt 3 are measured by the load cell. The total weight of the driving drum 15, the driven drum 16, the tension adjusting drum 19 and the support plate 20 is measured, and the article to be weighed 2a and the endless belt 3 which have already been measured from the measured total weight in the calculation unit, the driving An increase obtained by subtracting the total weight of the drum 15, the driven drum 16, the tension adjusting drum 19, and the support plate 20 is calculated as a measured value of the article 2b to be weighed.

  The supply means 7 includes a receiving tray 41 for storing the article 2 to be weighed, a standby hopper 42 for waiting for the article 2 to be weighed from the receiving tray 41 in accordance with the operation of the belt conveyor device 4, and a target to be delivered from the receiving tray 41. And a belt conveyor device 43 that intermittently moves the weighing article 2 toward the standby hopper 42. In the storage tray 41, the articles to be weighed 2 that are not yet divided into a certain amount are stored.

  The belt conveyor device 43 includes a driving drum 44 and a driven drum 45, an endless belt 46 stretched by the driving drum 44 and the driven drum 45, and a driving tray 44, a driven drum 45, and an endless belt 46. A mounting plate 47 attached to 41 and a rotation driving means (not shown) for rotating the driving drum are provided. The rotation driving means intermittently drives the drive drum 44 based on the rotation of the output rotation shaft such as an electric motor. Such a belt conveyor device 43 moves the article to be weighed 2 placed on the endless belt 46 toward the standby hopper 42 by intermittent travel in the B direction of the endless belt 46 by the rotational drive of the drive drum 44. As a result of this movement, a certain amount of the article 2 to be weighed is supplied to the standby hopper 42.

  The standby hopper 42 includes a shutter 48 that holds the article 2 to be weighed from the belt conveyor device 43 and an opening / closing mechanism 49 that opens and closes the shutter 48 by an operation of an electric motor or the like. After the endless belt 3 travels in the direction A by the operation of the belt conveyor device 4, the opening / closing mechanism 49 opens the shutter 48 to drop the article 2 to be weighed so that the article 2 is placed on the endless belt 3. To supply. The opening / closing mechanism 49 performs the closing operation of the shutter 48 after the article to be weighed 2 is supplied onto the endless belt 3.

  The control means 9 includes the selection unit 8 described above and a command unit that commands the electric motor 17 to operate the belt conveyor device 4 on which the article 2 to be weighed selected based on the selection result in the selection unit 8 is placed. 51. Such a control means 9 can be embodied by a so-called personal computer, for example.

  The selection unit 8 is configured to select a combination of the measured values of the articles to be weighed 2a obtained by weighing by the weighing conveyor devices 6. The selection unit 8 measures the weighing value of the article to be weighed 2a constituting the combination not selected by the selection of the combination of the weighing values of the article to be weighed 2a and the weighing of the article to be weighed 2b obtained by the weighing by each weighing conveyor device 6. A combination of values is also selected. In this example, the selection unit 8 determines whether the combined value and the target value are the same by regarding the allowable error of the target value as the same.

  In this example, the collecting means 10 is arranged below the downstream end of the endless belt 3 of the plurality of belt conveyor devices 4 and extends in the X direction, and below the downstream end of the collecting conveyor device 55. And an assembly receiving portion (not shown) that receives and aggregates each article 2 to be weighed and dropped from the downstream end. The collective conveyor device 55 transports the article 2 to be weighed, which is dropped from the downstream end of the endless belt 3, toward the collective receiving part by traveling of the endless belt 56, and shifts the article 2 to be measured to the collective receiving part. It has become.

  Hereinafter, a case where the articles to be weighed 2a and 2b are weighed by the weighing device 1 of this example will be described. First, as shown in FIG. 5, the opening / closing mechanism 49 is operated to open the shutter 48 that holds a certain amount of the article 2 a to be weighed, thereby dropping the article 2 a to be measured onto the endless belt 3. The article to be weighed 2a is supplied to the part P1 of the endless belt 3.

  Next, the to-be-measured article 2a in the part P1 of the endless belt 3 is weighed by the weighing instrument 5, and after the weighing, the rotating shaft 25 is rotated in the R1 direction by the operation of the electric motor 17, as shown in FIG. By rotating the rotating shaft 26 in the R1 direction through the couplings 29 and 30 engaged with each other by the rotation of the shaft 25, and rotating the driving drum 15 through the gear mechanism 24 by rotating the rotating shaft 26, The endless belt 3 is caused to travel in the A direction, and the article 2a to be weighed is disposed in the part P2 on the downstream end side of the belt conveyor device 4 relative to the part P1 by this traveling. Here, the selection part 8 performs the 1st selection which selects the combination of the measured value of each to-be-measured article 2a as mentioned above. Further, the supply means 7 performs the closing operation of the shutter 48 by the operation of the opening / closing mechanism 49 after the supply of the article 2a to be weighed, and then, by a intermittent operation of the belt conveyor device 43, a certain amount of the object to be weighed in the standby hopper 42. The article 2b is supplied, and the article to be weighed 2 thus supplied is put on standby by the standby hopper 42 as shown in FIG. 6, and after the article to be weighed 2a is arranged in the part P2, the supply means 7 puts it in the part P1. The article to be weighed 2b, which is an assembly different from the article to be weighed 2a, is supplied.

  Next, as shown in FIGS. 1 and 2, the to-be-measured article 2 b arranged in the part P <b> 1 is weighed by the weighing instrument 5. Here, the selection unit 8 performs a second selection for selecting a combination of the measurement value of the article to be weighed 2a that has not been selected by the first selection and the measurement value of each article to be weighed 2b. A third selection is performed to select a combination of measurement values of each article to be weighed 2b not selected by the second selection.

  Next, the belt conveyor device 4 is an endless belt on which the articles to be weighed 2a to be combined selected by the first selection are placed in accordance with a command from the command unit 51 based on the selection result of the selection unit 8. 3 is caused to travel in the A direction to discharge the article to be weighed 2a from the downstream end side, and each article to be weighed 2a dropped by the discharge is placed on the endless belt 56. Each of the articles 2a to be weighed on the endless belt 56 is moved to the collection receiver by the operation of the collection conveyor device 55 and mixed with each other. A new article 2 to be weighed is supplied by the supply means 7 to the part P1 of the endless belt 3 of the belt conveyor device 4 from which the article 2a to be weighed is discharged.

  Next, the belt conveyor device 4 moves each of the endless belts 3 on which the articles to be weighed 2a and 2b to be combined selected by the second selection are placed in the A direction according to the command from the command unit 51. And the articles to be weighed 2a and 2b are discharged from the downstream end side. The objects to be weighed 2a and 2b dropped by the discharge and placed on the endless belt 56 are moved to the collecting receiver by the operation of the collecting conveyor device 55 and mixed with each other. It should be noted that the article to be weighed 2 in which the articles to be weighed 2a and 2b are mixed and the article to be weighed 2 consisting of the article to be weighed 2a previously mixed are separate assemblies.

  Next, the belt conveyor device 4 travels in the A direction on each of the endless belts 3 on which the articles 2b to be combined selected by the third selection are placed according to a command from the command unit 51. Then, the article to be weighed 2b is discharged from the downstream end side. The articles to be weighed 2b dropped by the discharge and placed on the endless belt 56 are moved to the collection receiver by the operation of the collection conveyor device 55 and mixed with each other. The article to be weighed in which the articles to be weighed 2b are mixed is also the article to be weighed 2 in which the articles to be weighed 2a and 2b are mixed and the article to be weighed 2 in which the articles to be weighed 2a are mixed. Each is a separate aggregate. The weighing device 1 of this example weighs the articles to be weighed 2a and 2b as described above.

  According to the weighing device 1 described above, the article to be weighed 2 having the travelable endless belt 3 on which the article to be weighed 2 having the adhesive property is placed and the article to be weighed placed on the endless belt 3 is attached. A belt conveyor device 4 that discharges by running the endless belt 3, and a measuring device 5 that supports the belt conveyor device 4 and measures the article 2 to be weighed placed on the endless belt 3. In addition, when the article to be weighed 2 weighed by the measuring instrument 5 is released from the endless belt 3, the endless belt 3 is allowed to travel in the A direction so that the article to be weighed 2 is separated from the endless belt 3. The inertial force in the A direction can be applied, and the possibility that the article 2 to be weighed adheres to the endless belt 3 can be reduced, so that the article 2 to be weighed accurately can be continuously used. Can be obtained.

  According to the weighing device 1, since the surface 21 of the endless belt 3 that contacts the article 2 to be weighed contains silicon, the possibility that the article 2 to be weighed may adhere to the endless belt 3 can be reduced.

  According to the weighing device 1, the diameter of the driving drum 15 or the driven drum 16 disposed on the downstream end side of the belt conveyor device 4 is small enough to allow the article 2 to be weighed to be separated from the endless belt 3. The article 2 to be weighed can be peeled off from the endless belt 3 more reliably.

  According to the weighing device 1, the belt conveyor device 4 includes a driving drum 15 and a driven drum 16 that stretch the endless belt 3 so that the endless belt 3 can run freely, and a driving force that rotationally drives the driving drum 15 to run the endless belt 3. An electric motor 17 serving as a driving source for generating the electric motor 17 and a connecting mechanism 18 for detachably connecting the electric motor 17 and the driving drum 15 so that the driving force from the electric motor 17 can be transmitted to the driving drum 15. Therefore, when the article 2 to be weighed on the endless belt 3 is discharged, the electric motor 17 and the drive drum 15 can be connected by the connecting mechanism 18, while the article 2 to be weighed on the endless belt 3 is connected. Can be separated in order to disengage the connection between the electric motor and the drive drum 16, so that the article 2 to be weighed can be measured more accurately. Door can be.

  According to the weighing device 1, each endless belt 3 is arranged so that the weighed article 2 a is not discharged from the endless belt 3 and is fed to the position different from the position of the article 2 a by the supply means 7. 2b is supplied, and each measuring instrument 5 is configured so that an increase with respect to the measurement value of the article 2a to be measured becomes the measurement value of the article 2b to be measured. The selection unit 8 selects a combination of the measurement values of the articles to be weighed 2a obtained by the weighing by the weighing conveyor devices 6, and sets the measurement values of the articles to be weighed 2a constituting the combinations not selected by the selection and the respective measurement values. Since the combination of the measured values of the articles to be weighed 2b obtained by the weighing by the weighing conveyor device 6 is selected, a plurality of articles to be weighed 2a and 2b are weighed by one weighing machine 5. It can, therefore, may also improve metering efficiency with capable of reducing the installation space of the metering device 1 can reduce the meter 5.

  The weighing device 1 of the present example includes the endless belt 3 on which the article 2 to be weighed is placed on the parts P1 and P2. Instead, one article 2 to be weighed is placed. In such a case, the selection unit 8 may select a combination of measurement values of the articles 2 to be weighed on the endless belts 3. Good.

It is front explanatory drawing of the example of embodiment of this invention. It is a plane explanatory view of the example shown in FIG. It is explanatory drawing mainly of an engaging member of the example shown in FIG. It is IV-IV arrow directional cross-sectional explanatory drawing of the example shown in FIG. It is operation | movement explanatory drawing of the example shown in FIG. It is operation | movement explanatory drawing of the example shown in FIG. It is operation | movement explanatory drawing mainly of an engaging member of the example shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Weighing device 2, 2a, 2b Article to be weighed 3 Endless belt 4 Belt conveyor device 5 Weighing device 6 Weighing conveyor device 7 Supply means 8 Selection part 9 Control means 10 Aggregation means

Claims (7)

  A belt conveyor device having a travelable endless belt on which an article to be weighed having an adhesive property is placed, and discharging the object to be weighed placed on the endless belt by running of the endless belt, and A plurality of weighing conveyor devices that support the belt conveyor device and have a weighing device for weighing an article to be weighed placed on an endless belt, and a plurality of weighing conveyor devices The combination is selected so that the value obtained by combining the supply means to be supplied onto the endless belt and the measured value of each article to be weighed obtained by weighing by the plurality of conveyor devices is the same as the preset target value. A control unit that has a selection unit and controls discharge of the articles to be weighed by each of the plurality of weighing conveyor devices based on the selection result in the selection unit; A collecting means for collecting the articles to be weighed respectively discharged from the weighing conveyor device, and each endless belt is arranged so that one weighed article is not discharged from the endless belt and is fed by the feeding means. It is designed to run so that other items to be weighed are supplied to a position different from the position of the item to be weighed. Weighing device designed to be the weighing value of the item to be weighed.   The belt conveyor device includes a driving drum and a driven drum that stretches an endless belt so that the endless belt can freely travel, a driving source that generates a driving force for driving the driving drum to rotate the endless belt, and a driving force from the driving source. A drive mechanism and a connection mechanism that mechanically and detachably connects the drive source and the drive drum, and the connection mechanism includes a pair of the drive source and the drive drum. A rotation shaft and a pair of engagement members fixed to the pair of rotation shafts and engaged with each other with respect to the rotation direction of the pair of rotation shafts. A protrusion projecting toward the engagement member on the drum side, and the engagement member on the drive drum side includes a projection projecting toward the engagement member on the drive source side. One rotation of the side engagement member The projection of the engagement member on the drive source side and the projection of the engagement member on the drive drum side are engaged with each other by rotation in the direction, and driven by rotation in the other rotation direction of the engagement member on the drive source side. The projection of the engagement member on the drive source side and the drive drum are arranged such that the projection of the engagement member on the source side and the projection of the engagement member on the drive drum side are spaced apart from each other in the rotation direction of the engagement member The weighing device according to claim 1, wherein the engagement with the protruding portion of the engaging member on the side is released.   The measuring device according to claim 2, wherein a surface of the endless belt that contacts the object to be weighed contains silicon.   The measuring device according to claim 2 or 3, wherein a diameter of the driving drum or the driven drum arranged on the downstream end side of the belt conveyor device is small enough to allow the article to be weighed to be separated from the endless belt.   The metering device according to claim 4, wherein the diameter of the driving drum or the driven drum arranged on the downstream end side of the belt conveyor device is 10 mm or less.   Each of a pair of engaging member is a measuring device as described in any one of Claim 2 to 5 which consists of a coupling.   The selection unit selects a combination of the measurement values of the one article to be weighed obtained by the weighing by each weighing conveyor device, and the measurement value of the one article to be measured and each measurement constituting the combination not selected by the selection. The weighing device according to any one of claims 1 to 6, wherein a combination of weighing values of other objects to be weighed obtained by weighing by the conveyor device is selected.

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